Re: best stl structure for results?

From:

"Alex Blekhman" <xfkt@oohay.moc>

Newsgroups:

microsoft.public.vc.stl

Date:

Sat, 30 Sep 2006 00:43:42 +0300

Message-ID:

<#k3CXBB5GHA.1244@TK2MSFTNGP03.phx.gbl>

"PaulH" wrote:

I'm trying to find a data structure that can hold the
results of a
multi-stream throughput test so that I can easily print
the results in
a CSV file for later analysis and graphing.

What STL structure is best suited for this?

I was considering something like this:

   typedef struct _throughput_results {
       int nBytes;
       DWORD dwMilliseconds;
   } THROUGHPUT_RESULTS, *PTHROUGHPUT_RESULTS;

   typedef std::multimap<DWORD /*time*/,
THROUGHPUT_RESULTS>
STREAM_RESULTS;
   typedef std::map<int /*stream id*/, STREAM_RESULTS>
RESULTS;
   RESULTS m_Results;

But, I'd like to access the results as below:
for each (time)
{
   print time
   for each (stream @ time)
       print(", " + throughput)
}

//output
time, Stream1, Stream2, Stream3,...

If you can guarantee that for each time there will be some
results, then you could keep parallel collections: one for
times and others for stream results:

struct STREAM_SAMPLE
{
    int stream_id;
    THROUGHPUT_RESULTS thruput_res;
};

typedef std::vector<DWORD> TIMES;
typedef std::vector<STREAM_SAMPLE> STREAM_RESULTS;
typedef std::vector<STREAM_RESULTS> STREAMS;

struct RESULTS
{
    TIMES times;
    STREAMS streams;
};

RESULTS res;

Output:

for(size_t i = 0; i < res.times.size(); ++i)
{
    print_time(res.times[i]);

    const STREAM_RESULTS& stream_res = res.streams[i];

    STREAM_RESULTS::const_iterator it;

    for(it = stream_res.begin();
        it != stream_res.end();
        ++it)
    {
        const STREAM_SAMPLE& sample = *it;

        print_throughput_res(
            sample.stream_id,
            sample.thruput_res);
    }
}

HTH
Alex